44 results about "Crack spread" patented technology

The invention discloses a display panel and a manufacturing method thereof. The display panel comprises a substrate, the substrate comprises a display area and a surrounding area surrounding the display area, and the display panel further comprises at least one layer of protective layer covering the cutting area corresponding to a cutting line of the surrounding area. The display panel has the advantages that the protective layer is arranged at the edge of the surrounding area, the protective layer can absorb laser energy and release impact force when the laser technology is used subsequentlyfor cutting, edge film layers are prevented from being heated and impacted to generate cracks spreading to the display area, and problems that the film layers of the cutting area is prone to cracks due to excessive laser intensity in the existing technology and the cracks conduct inward into the display area to affect the display are solved.

The invention discloses a method for repairing cracks on the surface of key parts of a chain grate and relates to the technical field of machinery manufacture and material processing and application. The method comprises the following steps: firstly, according to the condition of cracks on the surface of the key parts of the chain grate, the cracks are polished and cut to remove the cracks completely, then laser cladding is carried out on the crack area by laser cladding technology, and laser-shock processing is carried out on the key parts of the chain grate after the laser cladding repair. The method has the advantages of simple process method, no need of vacuum and preheating, small damage to the base material of the key parts of the chain grate, realizing non-destructive repair of the cracks on the surface of the key parts of the chain grate and reducing the repair cost.

The invention discloses a rock type-I fracture crack speed and fractal dimension determination method. The method is characterized by, to begin with, selecting a straight cutting groove semicircle bending rock material test sample, which is finally formed by core drilling, cutting grinding and cutting groove prefabricating; then, testing the test sample through a three-point bending mode; througha high-speed camera, observing and recording crack growth forms in the sample loading fracture process, and collecting a voltage-time curve recorded by a strain gauge on an SHPB pressure bar in the test process and the crack growth process of each test sample recorded by the high-speed camera, and saving the recorded images as a file; and finally, processing the images recorded by the high-speed camera, calculating crack growth interval time and distance through Image J image processing software, calculating crack speed and acceleration speed through derivation, and furthermore, carrying out fitting to obtain fractal dimension of crack growth according to a box-counting dimension method and a least square method.

The invention provides a construction method for a three-dimensional digital core of fractured carbonate rock. The method comprises the following steps: constructing a three-dimensional digital carbonate core only containing matrix pores by using X-ray CT; determining the formation mechanism of a crack; constructing a rough crack surface and generating a crack with self-affine fractal characteristics by using a fractional Brownian motion model; determining the type of the crack according to the force mechanism of crack formation, synthesizing a crack with a certain width and carrying out rotation transformation so as to obtain cracks with different inclination angles; and subjecting the constructed crack with the three-dimensional digital core with matrix pores constructed by using the X-ray CT method to same-resolution superposition so as to obtain the three-dimensional digital core of the fractured carbonate rock with the matrix pores and crack pores. The construction method provides a medium for simulation study of the physical attributes of rocks of fractured carbonate reservoirs and has high application value in research on the physical properties of fractured carbonate rock.

The invention discloses a pavement crack rapid extraction method based on a two-step convolutional neural network, and the method comprises the steps: carrying out the classification and judgment of whether there is a crack in a sub-block or not according to the characteristics that a pavement image is large in size and the recognition time is long, discarding the sub-block which is judged to be not damaged, and carrying out the second-step semantic segmentation of the damaged sub-block. In the classification process, a convolutional neural network 1 subjected to hyper-parameter optimization for a fracture continuous topological structure is adopted for training, according to a training result of the convolutional neural network 1, in the semantic segmentation process, a convolutional neural network 2 without downsampling is adopted for training, and a segmentation result with pixel-level accuracy is output. Because the proportion of the crack area in the pavement image is far less than that of the intact area, the two-step extraction method of classification and segmentation can quickly discard a large number of non-target areas before segmentation, avoids wasting the computing power, and greatly accelerates the recognition speed on the basis of very small recall ratio loss compared with a crack extraction algorithm of one-step direct semantic segmentation.

The invention discloses a mountain crack detection method, comprising: analyzing collected images through an image sliding window, and determining the contrast ratio of each pixel point in the images; in dependence on contrast ratios, constructing and analyzing a contrast graph, determining the optimal segmentation threshold of the contrast graph, determining an area to be enhanced in dependence on the threshold, and performing image reinforcement processing on the area to be enhanced; analyzing processed images, and determining a gray scale characteristic graph and a variance characteristic graph; calculating optimal segmentation thresholds of the gray scale characteristic graph and the variance characteristic graph, and the binary images of contrast characteristics and variance characteristics, and performing AND operation on the two binary images to determine the binary image of racks; transforming the binary of racks to determine a refined frame, and performing area extension processing on the frame to obtain all crack latent areas on the frame; and traversing frame pixels to obtain crack length information, and calculating a crack area in dependence on the number of area pixels.

The present invention relates to the field of laser processing, particularly to a metal crack repair method. According to the present invention, mainly based on metal device surface cracks, a microcapsule adhesive is used to fill the crack, and then a laser shocking peening method is used to repair the metal surface crack, wherein a repair agent microcapsule and a curing agent microcapsule are completely mixed according to a volume ratio of 15:2 to prepare the microcapsule adhesive; when the laser shocking peening is performed on the metal crack filled with the microcapsule adhesive and the surrounding area, the capsule wall of the microcapsule adhesive is broken under the effect of the laser shocking wave pressure and the repair agent and the curing agent outflow so as to adhere the crack and achieve the ideal adhesion effect; with the laser shocking effect, the crack and the surrounding area are strengthened, the surface layer structure is compact, and the mechanical property is significantly improved so as to effectively prevent the crack diffusion and the generation of the new crack; and the dual effect is provided.

The invention relates to a lining crack identification method based on automatic image search, which mainly solves the technical problem that the existing identification method is influenced by factors such as finer cracks, more background interferences, poor crack continuity and the like, and comprises the following steps: S1, selecting an image containing cracks, and preprocessing the image; S2,selecting a starting point and an end point of the crack, and calculating an angle between the two points; S3, selecting a small area image by taking the starting point as a central coordinate, and performing scaling at different scales; S4, calculating CTA values of the images under different scales, and obtaining crack regions in the original small images by utilizing inter-scale association; S5, carrying out skeleton extraction on the crack area, obtaining a next image search center position, and searching towards a crack end point position; and S6, connecting the crack skeletons searchedfor multiple times to obtain complete crack coordinate information. According to the invention, the crack position information can be accurately and quickly acquired.

The invention relates to an on-line detection method of continuous casting billet surface longitudinal crack, belonging to the technical field of iron and steel metallurgy continuous casting detection. The method comprises the steps of showing the temperature difference value of a copper plate of a crystallizer to scene control personnel in a form of two-dimensional thermal image by detecting the temperature signal of a thermoelectric couple of the copper plate of the crystallizer; searching the abnormal change of temperature by utilizing computer vision technology according to the characteristics of formation of the surface longitudinal crack in the crystallizer and the temperature distribution; marking the crack area in the thermal image, extracting the geometry and movement characteristics of the crack area, and carrying out on-line detection on the formation and the development processes of the casting surface longitudinal crack. According to the method, crystallizer visualization is organically combined with the computer vision technology, so that the whole process of formation, expansion and movement of the casting billet surface longitudinal crack can be shown in a visual way. The limitation that the longitudinal crack is judged only according to the one-dimensional temperature trend can be overcome, the accuracy of longitudinal crack detection result is improved, and the method has a positive effect of controlling the quality of continuous casting billet.

The invention discloses a method for predicating crack arrest of a natural gas pipeline, and belongs to the technical field of pipeline design and manufacture. The method incudes acquiring a critical damage facture absorption energy value in unit area during sample fracture; creating a numerical value model under the service condition of the pipeline according to the finite element method, calculating damage facture absorption energy in unit area of a pipeline crack tip region, and taking whether or not the damage facture absorption energy reaches the critical damage facture absorption energy value as a criterion; calculating a crack speed and a gas decompression wave speed from the finite element model according to the criterion; if the crack speed is larger than the gas decompression wave speed, determining that crack arrest cannot be achieved after crack formation under the current service condition of the pipeline, or otherwise, determining that crack arrest can be achieved after crack formation under the current service condition of the pipeline. On the basis of the damage facture absorption energy, the method is used for predicating crack arrest performance of the pipeline by the aid of a tensile sample, thereby having a certain demonstration effect for pipeline safety guarantee.

The invention discloses a bridge crack detection method and system. The method comprises the steps that S1,conducting image collection on a bridge crack area; S2, minimizing the influence of texturesand details outside the crack region by adopting wavelet transformation; S3, removing noise blocks in the image by adopting an image morphological analysis method, and preliminarily segmenting crackinformation; and S4, connecting the disconnected cracks by adopting a crack connection method, filling small connected domains between the connecting lines, and further segmenting out complete cracksto realize bridge crack detection. When the cracks are detected, the connectivity of the cracks is not damaged, and the connectivity in a crack area or between edge pixels is not influenced, so that the complete skeleton structure of the crack can be truly represented, the detection reliability of the bridge cracks is improved, and the accurate assessment of the damage degree of the bridge is facilitated.

The invention provides an oil well used high-hole dense perforation fracturing and sand controlling device, which includes a perforating unit containing 2-4 perforators and an aftereffect acting part filled with perforated sand preventing material and boosting powder. The invention is characterized in that the perforating unit and the aftereffect acting part are both arranged in a cylindrical boosting chamber, the surface of the boosting chamber is a broken-line or streamline rotating curve, the middle part of the inner cavity are provided with 2-4 round holes for fixing the perforating unit. Fracturing charge is positioned on the outer side of the perforating unit, the sand preventing perforated material is positioned on the two sides of the fracturing charge, and the boosting powder is positioned outside the perforated material. The working principle of the device is using the explosion products of perforator charge to ignite the fracturing charge to fracture oil layer as the perforator perforates; using the high-energy gas produced by the combustion of the boosting powder to push the sand preventing perforated material into and staying in a hole passage punched by liquid jet, and a permanent sand preventing filtering screen is formed in the oil layer. The filtering screen is permeable by oil gas, but can block the quicksand. The invention can enable the perforating, the fracturing and the sand preventing tasks to be completed at once; can improve operation effect of the perforating and sand preventing; and can increase the oil and gas output.

The invention provides an improved flexible circuit board of a mobile phone display screen. The improved flexible circuit board comprises a flexible substrate and a bent area, a crack area is arranged in the part, without wiring, in the bent area and is a rounded rectangle area, delimited by scribed lines, in the bent area, the crack area is not hollow, a plurality of cracks are formed in the rounded rectangle, and the arc portions, connected with the flexible substrate, on the two sides of the bent area are coated with polyaurylamide layers respectively. The improved flexible circuit board is simple and practical, as the crack area is arranged, a hollow area is abandoned, and repeated plug is allowed; in addition, as polyaurylamide layer coating is used instead of reinforcing ribs, production of the flexible circuit board is greatly facilitated.

The invention provides a crankshaft remanufacture life evaluation test method. The method comprises the following steps: step one, measuring the crack area of a retired crankshaft; step two, determining the residual fatigue life of the retired crankshaft according to the relationship between the crack area and the residual fatigue life. By measuring the crack area of a retired crankshaft, the residual fatigue life of the retired crankshaft can be determined according to the corresponding relationship between the crack area and the residual fatigue life; compared to the prior art, not only the crack initial life is taken into account, but also the crack growth life is also considered, and thus the crankshaft remanufacture life can be evaluated more reliably.

The invention discloses an advancing waterstop sedimentation post-cast strip of a foundation slab. The advancing waterstop sedimentation post-cast strip of the foundation slab is characterized in that an advancing waterstop water-proof construction member is of an integral structure, a right angle type expansion joint is formed between the advancing waterstop water-proof construction member and the foundation slab, two side surfaces of the expansion joint are provided with steel moulding plates with reserved reinforcing steel bar holes; the horizontal extension joint is hollow, and the vertical extension joint is filled with waterstop caulking objects; the junctions of the extension joints and a foundation bed are provided with stainless steel waterstop strips; the junction of the advancing waterstop water-proof construction member and the post-cast strip is poured with a cement mortar screeding layer which is coated with flexible water-proof paint. The sedimentation post-cast strip has the advantages that the extension joints are changed into two right angle extension joints from a single vertical extension joint, so that a water permeation route is long; the advancing waterstop water-proof construction member has the advantages of small crack spreading range and good differential settlement control effect; the stainless steel waterstop strips can carry out tensile deformation along with sedimentation and have a corrosion resistant function; the downstream face resists water by using the flexible water-proof paint, the problem of water-proof invalidation caused by that a flexible water-proof layer of the downstream face can be easily peeled off can be solved; the steel moulding plates with the reserved reinforcing steel bar holes are used as dismounting-free moulding plates, and construction progress and quality can be improved.

The invention relates to a kind of silica gel face pack with permeating coating structure. The face pack is equipped with a crack area arranged longitudinally and a crack area arranged horizontally, and comprises at least one surface for material feed. The said longitudinal crack area is place for parts below eyes, and horizontal area is place for parts above eyes, which is characterized by easy material feed, good permeating and easy extending property.

The invention discloses a laser welding method capable of eliminating hot rolling delta-TRIP steel weld cracks. The laser welding method comprises the steps of splicing a tape head of a to-be-welded steel coil without pickling with a tape tail of the other steel coil; preheating the spliced seam; carrying out conventional laser welding on the spliced seam; heating the laser welding seam in a heating section of an annealing furnace; carrying out annealing in an annealing section of the annealing furnace; and performing normal post-process of the steel sheet. According to the laser welding method, a laser welding machine can not only perform the characteristics of laser welding, but also prevent crack spreading or even fracture on the laser welding joint, and the welding efficiency and the welding qualification rate can be obviously improved. During welding, the problems of low welding line energy of preheating and post-heating caused by high welding speed in the prior art are avoided, so that the welding speed is improved, and the welding time is shortened; and the qualified rate of the welding seam is ensured, and the cupping test value is increased from the original 1 mm to 4 mm at lowest.

The invention discloses a method for evaluating the fold-crack resistance of a coated paperboard. The method is characterized in that a horizontal fold-resistant instrument is used for folding the paperboard; since coated paperboards with poor fold-crack resistance present cracks with areas of different sizes at folds after folding, a scanner is used for scanning the folded paperboard on the basis of color contrast between a coating and fiber; image processing software Image J is employed for processing of an obtained image; the processed image is analyzed so as to obtain the proportion of the fold-crack area of the paperboard; and the fold-crack resistance of the paperboard is evaluated on the basis of the proportion, wherein the greater the proportion of the area is, the severer cracking damage is and the poorer the fold-crack resistance of the coated paperboard is.

The invention relates to an integrally cast vacuum circuit breaker monopole, and belongs to the technical field of circuit breakers. The vacuum circuit breaker monopole comprises a cast seal body, an inlet terminal insert, a vacuum arc-extinguishing chamber, an outlet terminal insert, a connecting rod and an insulated pull rod; the inlet terminal insert is fixedly connected with the left end of the vacuum arc-extinguishing chamber, the outlet terminal insert is fixedly connected with the right end of the vacuum arc-extinguishing chamber via the connecting rod, the left end of the insulated pull rod penetrates through the connecting rod and is fixedly connected with the right end of the vacuum arc-extinguishing chamber, the outlet terminal insert is located below the insulated pull rod, and the inlet terminal insert is coaxial with the insulated pull rod; the inlet terminal insert, the vacuum arc-extinguishing chamber, the outlet terminal insert and the connecting rod are all embedded into the cast seal body, the cast seal body is detachably connected with the insulated pull rod, and the cast seal body is integrally cast. The cast seal body is fixedly connected with the inlet terminal insert and the outlet terminal insert in a seal manner, so that the insulating property is good and the sealing property is strong; and the cast seal body is cast by adopting a novel casting process, so that an excellent progress is made on the aspects of impact absorption, breakage resistance, crack spread resistance and the like.